*lß TAB. 336.
ARTHRATHERUM CALOPTILUM, N ob.
ARTHRATHERUM, Pal. Beauv. -^V'-Confer supra, p. 5o.
ARTHRATHERUM CALOPTILUM, Nob.
Dense caespitosum; multicaule; cauliculis sterilibus paucis v. nuliis. Caulibus g laberrimis. Foliis
elongatis, involutis, subulato-filiformibus, extus glabris, intus tomenteliis; vagina apice barbato-ci-
liata, caetero glabra. Glumce valvis incequilongis, scabro-puberulis, lineari-oblongo-lanceolatis, subuni-
nerviis, convolutiöne quasi subulato-acuminatis, Valva externa longiori. Flore brevissime stipitulato.
Palea externa (apice immediatim cum arista articulatd) scabriuscula, delapsa arista emarginata. Aristae
{parte indivisa elongata, conlortd) laciniis lateralibus nudis, lacinia media ex tota plumosa subtriplo
brevipribus. Caryopsi esulca.
Gramen caudice brevi diffuso v. ascendente ramoso vaginis emarcidis vestito demum fruticuloso perennans. R adix e fibris
plus minusve elongatis crassiusculis simplicibus subfasciculatis juventutelanuginosis demum induratis constans. Caulks adjecta
inflorescentia 1/2-1 1/2-pedales, aggregati, erecti v. ascendentes, geniculati, graciles, simplices, teretes, medulla farcti, glabri,
l®vigati v. papillulis oculo nudo inconspicuis scabriusculi, obsolete striatuli, pauci-nodi, ad basin foliosi et vaginis imbricatis
obtecti. Nodi crassiusculi, glaberrimi, constricfciplerumque rufescentes. Internodia elougata, demum plus minusve exserta.
Articulus summus subfiliformis, strictus, ineunte floratione vaginam vixsequans. Folia 3-7 pollices longa (imo folium summum
■ haudraro semi-pedale), glaucescentia, tenuia, rigidula, alia subfalcatav. varie flexuosa, alia strictiora, ecarinata, nervosa
(sub lente), extus glabra laevigata, intus tomentella, marginibus attenuata et (sublente)cartilagineo-serrulata, basi articulata.
V agin* infimjE aphyllae, chartaceae, persistentes, complicatae, subcarinatae, striatae(7-v. 9-nerviae), stramineae, dilatatae,
ovato-v. oblongo-lanccolatae, acutae, glabrae, lasvigatae. V agina; foliiferä tubuloso-involutae, herbaceae, ecarinatae, 7-nerviae,
olio concolores, lsevigatae, marginibus membranaceae, apice rotundatae et villis albidis elongatis conspicue barbato-ciliat«, ore
annulo setularum brevissimarum barbulatae, caeterum glabrae. L igula nulla. Panicula (sub anthesi forsan nutans; fructifera
erecta, plus minusve contracta) 3-6 pollices longa, simplex, laxiuscula, oblonga,espiculis numerosis composita. R hachis
ßliformis, continua, semi-teres, scabriuscula, stricta. R amuli subcapillares| alterni, distichi, solitarii v. interdum inferiores
gemini, simplices,- scabriusculi, spiculas 3-5 (interdum 7 v. solum 2) longius breviusve pedicellatas racemosim dispoSitas
gerentes; ramuli superiores inferioribus gradatim breviores. P edicelli capillares, in «equal es (alii gluma breviores , alii
longiores); scabri, stricti, apice incrassati. Gluma persistens, stramineo et violaceo variegata, flore subtriplo longior (praeter-
missaarista). Valve inaequilongae, subconformes, uninerviae, v. trinerviae nervis lateralibus infra medium valvae evanescen-
tibus, subnaviculares, carinulatae (nervo medio filiformi), ex oblonga basi longe lineari-angustatae, convolutione quasi
subulato-acuminatae, apice modo acute v. obtuse 2-aut 3-dentatae, modo truncatae v. acutatae integerrimae. V alva
exterior (inferior) 7-8 lineas longa, basi intrusa amplexatilis. V alva interior paululo altius inserta, valva exteriori
circiter sesquilinea brevior, intus ad basin rudimentum stipitiforme brevissimum obtusum glaberrimum adhaerens alterius
floris gerens. F los adjecta arista sua 3-3 1/2 pollices longusr(absque arista 1 1/2-2 lineas). Stipitulus brevissimus,
crassus, subturbinatus, cartilagineus, dense setulosus, basi subulato-angustatus, apice circumbarbatus : setis inaequalibus,
albidis, majoribus dimidiam paleae externae longitudinem superantibus. Palea externa (generis more tubuloso-involuta, te-
nuiter trinervia, chartacea, ecarinata, demum rigida) oblonga, apice subangustata, facie marginibusque glabra, dorso papillulis
minimis oculo nudo inconspicuis scabriuscula, apice cum arista articulata, delapsa arista emarginata. A rista violascens
v. albida, longissima, speciosa, e subulata basi setacea, generis more supra basin trifurcata et ad ramiücationem geniculata;
pars indivisa 5-8 lineas longa (plerumque glumam paululo superans), (iliformis, nuda, scabra, contorta, antice canaliculata;
lacinise laterales capillares, nudse, scabra, divergentes v. subdivaricatae, strictse, 5-8 lineas long®; lacinia media robustior laciniis
lateralibus, recta, scabra, ab ima basi longe denseque plumosa, apice nuda. P alea interna (generis more minima, mem-
branacca, hyalina, enervia, involuta, ecarinata, glaberrima) cuneato-obovata, apice truncato-rotundata, interdum retusa v.
obsolete crenulata. Squamdl^-hypogtn* gemin®, oblique spathulat®, obtus®, integerrim®, striatul®, submembranace®, gla-
berrim®, palea interna sub®quilong®, ovario sub anthesi longiores. Stamina 3, supra basin stipituli ovarii inserta. F ila -
menta flaccida, capillaria. Anther* lutescentes, glabra, elongat®, lineares, basi et apice emarginat®. Ovarium minimum,
obovatum, stipitulatum, glaberrimum. Stigmata 2, terminalia, elongata (paleam externam sub®quantia), filiformia, dense